197791664 has 20 divisors (see below), whose sum is σ = 437967504. Its totient is φ = 84767808.

The previous prime is 197791663. The next prime is 197791669. The reversal of 197791664 is 466197791.

197791664 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (197791661) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 882887 + ... + 883110.

Almost surely, 2^197791664 is an apocalyptic number.

197791664 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

It is an amenable number.

197791664 is an abundant number, since it is smaller than the sum of its proper divisors (240175840).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

197791664 is a wasteful number, since it uses less digits than its factorization.

197791664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1766012 (or 1766006 counting only the distinct ones).

The product of its digits is 571536, while the sum is 50.

The square root of 197791664 is about 14063.8424337021. The cubic root of 197791664 is about 582.6431720866.

The spelling of 197791664 in words is "one hundred ninety-seven million, seven hundred ninety-one thousand, six hundred sixty-four".